Re: [PATCH 1/1] perf build: Fix Python extension build with GCC 16 hardening

[Thomas Richter]

On 5/20/26 14:56, Jan Polensky wrote:
> The Python extension build fails with modern GCC versions (16+) due to
> the new hardening feature that prevents dynamic relocations in read-only
> segments:
> 
>   /usr/bin/ld.bfd: error: read-only segment has dynamic relocations
>   collect2: error: ld returned 1 exit status
> 
> This occurs when building the perf Python bindings because the linker
> enforces stricter security policies by default.
> 
> Add -Wl,-z,notext to LDSHARED to explicitly allow text relocations in
> the Python extension shared object. This is necessary for the Python
> C extension to link successfully while maintaining compatibility with
> the Python build system.
> 
> The flag only affects the Python extension build and does not impact
> the security of the main perf binary or other components.
> 
> Tested on Fedora 44 with GCC 16.1.1 20260501 (Red Hat 16.1.1-1) and
> Python 3.14.4 on s390x architecture.
> 
> Reported-by: Thomas Richter <tmricht@xxxxxxxxxxxxx>
> Signed-off-by: Jan Polensky <japo@xxxxxxxxxxxxx>
> ---
>  tools/perf/Makefile.perf | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/tools/perf/Makefile.perf b/tools/perf/Makefile.perf
> index bfb37f527241..12af424dd5c1 100644
> --- a/tools/perf/Makefile.perf
> +++ b/tools/perf/Makefile.perf
> @@ -749,7 +749,7 @@ all: shell_compatibility_test $(ALL_PROGRAMS) $(LANG_BINDINGS) $(OTHER_PROGRAMS)
>  $(shell [ -d '$(OUTPUT)python' ] || mkdir -p '$(OUTPUT)python')
>  
>  $(OUTPUT)python/perf$(PYTHON_EXTENSION_SUFFIX): util/python.c util/setup.py $(PERFLIBS_PY)
> -	$(QUIET_GEN)LDSHARED="$(CC) -pthread -shared" \
> +	$(QUIET_GEN)LDSHARED="$(CC) -pthread -shared -Wl,-z,notext" \
>          CFLAGS='$(CFLAGS)' LDFLAGS='$(LDFLAGS) $(LIBS_PY)' \
>  	  $(PYTHON_WORD) util/setup.py \
>  	  --quiet build_ext; \

Thanks for fixing this.

Reviewed-by: Thomas Richter <tmricht@xxxxxxxxxxxxx>
Tested-by: Thomas Richter <tmricht@xxxxxxxxxxxxx>

-- 
Thomas Richter, Dept 3303, IBM s390 Linux Development, Boeblingen, Germany
--
IBM Deutschland Research & Development GmbH

Vorsitzender des Aufsichtsrats: Wolfgang Wendt

Geschäftsführung: David Faller

Sitz der Gesellschaft: Böblingen / Registergericht: Amtsgericht Stuttgart, HRB 243294